You can find Spline's camera controls on the bottom center of the Viewport.
To navigate between views, simply press the axis points.
By hovering the view helper you'll be presented with two extra options to choose from.
Quickly reset the view of your scene or go into an Isometric view.
Below the view helper there are two different camera views to choose from.
Orthographic and Perspective.
- Orthographic: All angles are parallel.
- Perspective: All angles change based on the distance from the camera to the object.
Here's a video using the view helper to quickly change views and changing between Orthographic and Perspective views. (Shortcut
The zoom value can be found on the toolbar. By pressing it you'll find the zoom options.